| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [verb] been for [adv] | 30 |
|
| 2 | [verb] been operating for | 15 |
|
| 3 | [verb] been operating [adv] | 11 |
|
| 4 | been operating for [adv] | 7 |
|
